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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c1829c8408f3790310cc379cfdfa1d5d1c00f05a12245b10d5741d4daf8fb2' 
  AND token = 'gPXZg5ec4Zur+C8OWFRRCwLt46e568ThUPOMFwxnhFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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