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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bafddee58d30b956d072d360f49511fab0616d14798077f83813f3b5f21637' 
  AND token = 'OBAY7fO2PuMljrQGmdmru0B5tSisBzWyN3JJ0l/iYM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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