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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8fd98b012e5062955c9a281f7fe17538ff4af83018f386fd2d1af19f6ae2e3' 
  AND token = 'jbM5NVbtgduvHS1j4fL+CbBXSLnr3mBENNVcsMs2x20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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