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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70c89d2374b0edb6c0ddf7c42603e6712d3792ea1ab6f632ae14bc1763292c9' 
  AND token = 'a7GfnQUMZS0Iy8MPOzXijv9gh8QbkURkoljC2lbyrpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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