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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4973c0ca566a9d4d46a6aa4e9ac13331a99029f2f530543207771a0093cca5' 
  AND token = '7luwLbG+lpNED0+Nl/U/mM6WPeRNDSHAuCNQr3GnuBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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