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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23480a12e552eabcba496b4c62a2c259c446d64d14300fa5714a6653e4c84f1e' 
  AND token = '75e96JK4UImt7N8ruD5CVMPWPOUr6Pjnisi1/3LRTOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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