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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac690011a7d3211e6c87d8d0654abfe2d9de0e8aabc157a8c90e058d631c06e4' 
  AND token = 'JRbedbb89Eb54sG3dj7dw06CDOFA1zlEgJ0iv0wIOlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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