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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6a56f55f30eb030648df850d99836c74262058957c47ca95ba034587083ff6' 
  AND token = 'gb7ZOrNmfOpG5yPMLpEoyUyrnS5fo0s+q0APmTaReb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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