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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45637ea6910c901ce8f668cd424d186245938ef7ad968ca87680cd5543972cde' 
  AND token = 'nQSecm5/dydj2LfMiaLMQ/IR83fXZbWfQdVOh8rg09g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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