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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c3592ab2b8fbc24625fbcc2ecb40e921d47eec0c9e3908ce067d73361f0bd2' 
  AND token = 'i9ooS2kLMOO70hQB8ocRAvefIJI9lTYDsIIPPYtf8N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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