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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1354cb89b4da41839307b10920c8addeebe8e4e3caa4d3b9ad9eb1e2da5edd7e' 
  AND token = 'R/Kd8fjAy1Vyij6t/ZK51jCtjvDrNGEJ6sEi8dS4fQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}