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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '188d8a351f935efe8ec182b510fed87d1711dc4a7356d966c64cb6408d7b5329' 
  AND token = 'Ogun5GOkinu5F8QGFjVuWrDum89iGmuO1fboRRQoqeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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