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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbdf47b290e407f40548771073ef28b229093747003087c67b67dbeeb1c1a34f' 
  AND token = 'xGdy2w4eh96YDt8415jL2STo6ANcHAoCJgIJSbZZxjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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