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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99ea32e3a4219270ef322ceda681507b694ca10c795c776d4d6630931b78b1f' 
  AND token = 'jv/ieE26qez5PWBg22tGyk+d0gCpNTr0zqKqTHJouHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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