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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a070b204a27df4ee51e46f6a938c3f6e02ddf5075a1092de977ec4715a5926b' 
  AND token = 'QssV0l05aezWLmRai4tXFcvHdcZYTRPbiQsOS49Jc74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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