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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe4a2a9aee899893908c4a550113814f32e227ddaa03be72447eff5d8bb146bc' 
  AND token = 'i6258R1YbwbIBFVunMWl2L/xM50gTx0h5+3xrfpT+ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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