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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf96e489489113575f75ce0166c7255a26e9f47a52ea93205c52948328b6a9b' 
  AND token = 'FT+DcAvS5sHw4CkCKYrFLxEzcrraGv6r2tb5CpzZ04I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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