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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6383b9d3fed152f94c360e3309fd34b86f3abf1e29244d9f099e22370d01f432' 
  AND token = 'ppGpoSKnrdJjqe7vZC2mJ3z8jdE4+Dwx5WBC6fxNGD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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