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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2db01d85562ab66d34d382260faa496e8fecfa1d2cd783f14950ed33a3af379' 
  AND token = 'wiHPsWVVDKPvVi+wt69HI7KlEIk/OrWviISwwnF8yDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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