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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17289c477c3b127369ba63da1def37ea87593ed205fae617cd3b660f7b68381b' 
  AND token = 'Rwqvm83iZz93xFmaRnoVMsy4Ru2UR4ALXI40CKKQlfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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