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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ee12c09e0e01bf3b2f8f9d2201b2b8755af4f09335368d8e8e041700ba6540' 
  AND token = 'NtIzgBtvEclGRrKJVwFIB4ZB08dgED7i2OwEXdm+7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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