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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032b79f77e29a50c0b877e3bf23dcec87892038202491ada9467e0f66cfcae02' 
  AND token = 'Ns0nvXbLtLpgR2e1JympufmEF2EtM1WE4nlxr01KbGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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