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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a1ea942a420c0dfcad38c6462162de746911da37520ddff014dde34243bf1c' 
  AND token = 'GIKV73EHqEqtSuh6taTrHlIovt1GRStOBn5UG6HiJfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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