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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3401f9c4114b191b170d5f36458f6a0870d90f92a025893b684cad48adc3a0ac' 
  AND token = 'swoi3VHMcwOO836owgyPck6X/2Fl7GEajlMihwc1Kmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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