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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd0cd83725011ff1fecb0edaeb8f0354797f88f00f30056f5c23964b9eeffc8' 
  AND token = 'bnsyIC3auPUhbEixXELoqyfcOBYEooH8EZ5hNGZu4qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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