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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6296a393a19a318aed3dd0f28fa0225f3ff4a6235d512cbff939e89545af770f' 
  AND token = 'shObRIqVoBp32fuqulXIFeOJvxBRLHbuIW2EUdHCIoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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