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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c7286e0aa44811828e0182acda5e9d5a52eb45762a50760a11dbf8662f4871' 
  AND token = 'L2Tkq0i/+eLsP51NSvSZJB2e7Jiz8ebSLqk8PuyctYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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