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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f6f30fe5f598f49ad41a324fd5da6c1788191156d0250657fa556db0bc8e62' 
  AND token = 'KNQbLb7KDVKpJSqSqvUtQwANzaZzkleifPZk6kT4L0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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