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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7376d8adc2d114c196321a3a6b9ca0a073f88f297fd0e2163aa16b565992920' 
  AND token = 'ybcDte1ztpwNiksIa5d995GW3+45/KBwisbbWBCtNtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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