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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c6ddc20f2d2ffa22731496d44a3e0ac337fd5f4cd0a22d9cc61fa130084b7f8' 
  AND token = 'fPSImCBJhVOtudHfUelkwKv4C9WBAdVN0EpJuNoBnQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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