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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a482863aa89d30ea38b408f13f519419d8aa4047fcb9fbf80624f6b59f6aa8' 
  AND token = 'Ljq6ewyxanaa0/p+Y8rF51JH0YqijIELc2MgNjFzkUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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