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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f666f460b1e1e9973f21734316d3082b35df024418ddc261d9bf2a380913b0' 
  AND token = '74cnuSZ1S1R58eMaJWZANot3szEMKqO7QscV2gYqklw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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