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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59fdc0e8f3da3a5e131623ea4f5553ac400a584bcc900c298235684afcc1b83' 
  AND token = '1vo4podQ2aEUudXmW7eB/Ja4/4FfGL+Z+gOAGbs3EJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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