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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4113e52ba0306bd92c7f2a2dd4f31f1fc5cdf115750f20a03d7c82654c6a0f11' 
  AND token = 'l/1tNc1jLrdYtlsgx3llHRhUb9wnhb2bLZUjvBlNmBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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