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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65e829a64a20955c2ca1dd1f05165ced9a0054e6801959582329d15b4fff1e9d' 
  AND token = 'PHbnHnjgLIkRDtT01h1aWlrVwZHZ5fEhKg1Qmai3Nog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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