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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ea85df4f9e64c549c1311d9f5feeb4f6ba07b6a9b5f2d58507fb5e28e8fdc2' 
  AND token = 'fVOti/3vrl7+Sttlr6ISAzZHO3VTr2YEmlbCY9K+36w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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