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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a17aaa20f30e2b54fb520803310344f10a3963f21edae86d76edaeac13fe184' 
  AND token = '8fL69wtvdDZ4zi14mZqonAAzR6uiu6cIxOOZNn+33+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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