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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60f389c7337b73a22cf915574312ec6bcf94785a56472fcb4a6eeab585302bf2' 
  AND token = 'g5kOnlIiEigwW4+ZGWbnfAzrfhmYCTaGEHYe8O/7i+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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