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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7533d8006e0eadbef2783cbe96ab7d7f16defcc92ba67a93653ffba80b2f5072' 
  AND token = 'CN9YkbOoB5n0qywtvO7bIB694y4sSJ5Boib+d0mZUt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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