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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86f6a106e29fa532443d0c78a39e82c3482c7a39b39a858a15822c0188cc561' 
  AND token = 'to1T4fMAnafqHyUDiOsl0Gwh/qhtR8WW2IijVxD6S58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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