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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb5ea7a663d048650fb58b5570101f4f2c57ea987506f62820fa173d0692b77' 
  AND token = 'MvGJVtBwNeZN69eBiwOJbJHmxEXUHO7CKm1Umz9FRr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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