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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735e284ef9e493f07859300e666c37df6449ba7e36eed26d2bd42bec2e723db3' 
  AND token = 'JTxZnVb/CcaePRGWh4k7vPHa4p9T5doRQWkgDU6X5lI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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