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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01e3824775bc82ce681aba8d5426c2126216c5c004a6557a223fb700f153c8c' 
  AND token = 'sNf7b77mFBBm3lCR+9rAvKut1H/6DXpGBuTSJXsMP0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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