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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbc6de2f24acd16a18ff8c4fd8cf97500cbbdb5730fb48845695af5a4db7e59' 
  AND token = 'W+9tmHo6pNddQHR9JHCSLqamD6RD8GEs3WqXsEHCrTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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