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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bdf4d5039f98fb1a0f7d944dd494aac72e55dfb59591dc4e8e522d53550a8f6' 
  AND token = 'cbhj/I4S8l0cueVQm/5VVVjUyeMl8DoGkAhztjEc5Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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