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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7aebeae574a2063d3e14c6cc87e65a39b52629b5e97f9c02e49f9cd73d26fb' 
  AND token = 'rHEnu2uRpZUZMnZhG/hhHUpPSa6bpL76qVsBKlUHfUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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