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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bd774100adff4d4e574e6437114aaaeccfa53f31bff13e22ac56dc21f65add' 
  AND token = 'NqOoNApzr6MDbW/Sgn73Skgdlu27OkHfvSg7lf2RHy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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