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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8b68506a6b27d155524b6a78257d3141007e10caa7f6296e5691396e4d53be' 
  AND token = 'cYp1qZjA2n1Ylbm9jccnXxaRpW/0qLVUABqI424TWQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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