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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb87ffaba545570ac6942d2bb5d34773e6f7e63733820c1984bdf1900b02df7' 
  AND token = 'IGozTNt0/6pzpyVva2wh2h2EIy1hz/Eh3ve9Df7+IEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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