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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a0e346cc59321cbe1a64ca117dd59da3e0bbde1d2c3124387c4b0602351681' 
  AND token = '/WrazXiDTgbndfRQ6CTWYilkhetzA4NHOHbzrTVMx/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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