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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c5f940b9cbf1f6dac9b93997326f02967e05a6f531ea7739ced612603ee42e' 
  AND token = 'oO/hkr37GPVA9uW1il99Ezn5+T7MSBQ0D1pLfmwlgZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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