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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa93b72e6fd17a96e7af152bad61d0a38c42b99f4ef22cbb786363f3e576408f' 
  AND token = 'EQwVcd2DKHpTsYWjF4etrT/cNrR4EFcKEtjijojXKl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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