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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773d17a18ada1142a51416c978efa341a459422a11bbde0badc244a8fe8be3dc' 
  AND token = 'Pe3vF2K+as1jXTNA5LV6cGEuNCoLqbuBDwQMhF9cA30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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