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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b94c9513128123ec8e8787edd56f223027504ad3792622baab2c3e0bc14170a8' 
  AND token = 'zV36QgnlnxPxD3Gjjt9p5GkKb2erfYha0uU5z449pPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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