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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfdc631847f2225ddb050f6d1700bb026af5a28ff5fae669317269a0bd3882eb' 
  AND token = '+58aymz3G0QsCiLnWZHtMfTCAjLBA5wrBQqAC6CZ/3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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