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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb32ca305a7bf88631dd81db07384eb1cd7e228addf73ff68d30b0a1f309ecc' 
  AND token = 'aVzgKy03OtjP1kyn/08UysLAMgM9Siqfee/mwA28jLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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