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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1be2b3f0ea692fbf78d0d36be37da111639bd41f204d0b2b30d3c6b1119c51b' 
  AND token = 's/J0VJ5RP0YjHgndSiOvjdrBqCYONPRJEczJ7h9maBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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