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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0b8511debbe335d28c6ebe38dd3e5a9907c7f50ef2e05613bb8f4ab01769ea' 
  AND token = 'ysZUXFeSd+9108/v39QU25aGf1dYxDUSUSPg+Rh4fFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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