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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef179d625d4a70bf7cf2cf40f7e82d1dfad2e615174a2bbcee945fef63b0b4d1' 
  AND token = 'P1JDAd+URVD8NffcduExFtjv03B/vv0sh6yhD7l8lKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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